JP2022518394A - Channel sounding with multiple antenna panels - Google Patents

Abstract

Channel sounding with multiple antenna panels. The method of operating the wireless communication device (102) is to generate a reference signal sequence (150) based on a base signal sequence and a shift signal sequence selected from a plurality of candidate shift signal sequences (1001), and wirelessly. Through the antenna port (5031-5033) of the plurality of antenna ports (5031-5033) of the communication device (102) and the antenna panel (5023, 5023) of the plurality of antenna panels (5023, 5024) of the wireless communication device (102). Includes transmitting the reference signal sequence (150) via 5024) and (1002). The shift signal sequence is selected from a plurality of candidate shift signal sequences depending on the antenna panel (5023, 5024) used to transmit the reference signal sequence (150). [Selection diagram] FIG. 5

Description

Various examples of the present invention generally relate to the communication of sounding reference signals. Various examples of the present invention specifically relate to the sounding reference signal and the communication of the indication regarding the antenna panel used to transmit the sounding reference signal.

In mobile communication, (i) higher transmission throughput and (ii) reduction of power consumption of mobile communication devices (sometimes referred to as user terminals and UEs) are required as before.

Some UEs include an array of antennas (antenna array) capable of transmission and / or reception (communication) in a beamforming manner. That is, phase coherent transmission of the entire antenna of the antenna array of the antenna panel is possible. This allows beam communication for specific purposes. In that regard, spatial multiplexing and / or spatial diversity may be used to improve transmission throughput.

Some UEs include a plurality of antenna panels, each antenna panel comprising one or more antenna arrays. By providing a plurality of antenna panels, flexibility in communication with a plurality of beams is improved. This helps to further improve the transmission throughput.

On the other hand, it is known that operating a plurality of antenna panels may increase power consumption in the UE.

For example, from document R1-1813334 of the Third Generation Partnership Project (3GPP), the use of the Sounding Reference Signal (SRS) series for UpLink (UL) beam management is known. There is. The association between the SRS resource and the antenna panel may be reported by the UE, so that the network will accommodate a small number of UE panels if the expected gain from using more UE antenna panels is small. You can configure the resource index. See also 3GPP R1-1813490.

Such reporting operations can have drawbacks such as increased control signaling overhead on the wireless link between the UE and the network.

Therefore, there is a need for advanced techniques for performing communication in communication systems, including transmitters (with multiple antenna panels for beamforming), and receivers. Specifically, there is a need for techniques to overcome or mitigate at least some of the constraints and shortcomings identified above.

This need is met by the characteristics of the independent claims. Dependent claims define an embodiment.

A method of manipulating a wireless communication device comprises generating a reference signal sequence based on a base signal sequence and a shift signal sequence selected from a plurality of candidate shift signal sequences. The method also includes transmitting a reference signal sequence through the antenna ports of the plurality of antenna ports of the radio communication device and through the antenna panels of the plurality of antenna panels of the radio communication device. The shift signal sequence is selected from a plurality of candidate shift signal sequences depending on the antenna port and / or antenna panel used to transmit the reference signal sequence.

The computer program or computer program or computer readable storage medium contains the program code. The program code may be executed by the control circuit. By executing the program code, the control circuit is made to implement the method of operating the wireless communication device. The method comprises generating a reference signal sequence based on a base signal sequence and a shift signal sequence selected from a plurality of candidate shift signal sequences. The method also includes transmitting a reference signal sequence through the antenna ports of the plurality of antenna ports of the radio communication device and through the antenna panels of the plurality of antenna panels of the radio communication device. The shift signal sequence is selected from a plurality of candidate shift signal sequences depending on the antenna port and / or antenna panel used to transmit the reference signal sequence.

A method of manipulating a wireless communication device involves controlling a modem to generate a reference signal sequence based on a base signal sequence and a shift signal sequence selected from a plurality of candidate shift signal sequences. The method also controls the modem to transmit a reference signal sequence through the antenna ports of the multiple antenna ports of the wireless communication device and through the antenna panels of the multiple antenna panels of the wireless communication device. include. The shift signal sequence is selected from a plurality of candidate shift signal sequences depending on the antenna port and antenna panel used to transmit the reference signal sequence.

A method of manipulating an access node in a communication network comprises receiving a signal sequence from a wireless communication device and comparing the signal sequence with a candidate shift signal sequence of a plurality of candidate shift signal sequences. Each of the candidate shift signal sequences is associated with the antenna panel of the plurality of antenna panels of the radio communication device and the antenna port of the plurality of antenna ports of the radio communication device. The method also includes determining the antenna panel and antenna port based on the above comparison.

The computer program or computer program or computer readable storage medium contains the program code. The program code may be executed by the control circuit. By executing the program code, the control circuit is made to implement the method of operating the access node of the communication network. The method comprises receiving a signal sequence from a wireless communication device and comparing the signal sequence with a candidate shift signal sequence of a plurality of candidate shift signal sequences. Each of the candidate shift signal sequences is associated with the antenna panel of the plurality of antenna panels of the radio communication device and the antenna port of the plurality of antenna ports of the radio communication device. The method also includes determining the antenna panel and antenna port based on the above comparison.

A method of manipulating an access node in a communication network involves receiving a signal sequence from a wireless communication device and controlling a modem to compare the signal sequence with a candidate shift signal sequence of a plurality of candidate shift signal sequences. Each of the candidate shift signal sequences is associated with the antenna panel of the plurality of antenna panels of the radio communication device and the antenna port of the plurality of antenna ports of the radio communication device. The method comprises determining the antenna panel and antenna port based on the above comparison.

The wireless communication device generates a reference signal sequence based on the base signal sequence and the shift signal sequence selected from the plurality of candidate shift signal sequences, and via the antenna ports of the plurality of antenna ports of the wireless communication device. Moreover, the control circuit configured to transmit the reference signal sequence through the antenna panels of the plurality of antenna panels of the wireless communication device is provided. The shift signal sequence is selected from a plurality of candidate shift signal sequences depending on the antenna port and antenna panel used to transmit the reference signal sequence.

The access node of the communication network includes a control circuit configured to receive a signal sequence from a wireless communication device and compare the signal sequence with the candidate shift signal sequence of a plurality of candidate shift signal sequences, and the candidate shift signal sequence of the candidate shift signal sequence. Each is associated with the antenna panel of the plurality of antenna panels of the wireless communication device and the antenna ports of the plurality of antenna ports of the wireless communication device. The control circuit is further configured to determine the antenna panel and antenna port based on the above comparison.

It should be understood that the above features, and the features described further below, may be used not only in each of the combinations shown, but also in other combinations or alone, without departing from the scope of the invention. ..

FIG. 1 is a schematic diagram showing a communication system according to various examples. FIG. 2 is a schematic diagram showing details of the nodes of the communication system according to FIG. FIG. 3 is a schematic diagram showing details of the wireless interface of the node of the communication system according to FIG. FIG. 4 is a schematic diagram showing a time-frequency resource grid containing a plurality of resource elements allocated for transmission of an SRS series, according to various examples. FIG. 5 is a flow chart of a method according to various examples. FIG. 6 is a flow chart of a method according to various examples. FIG. 7 is a schematic diagram showing mapping between (i) an antenna port and an antenna panel and (ii) a candidate shift signal sequence according to various examples. FIG. 8 is a schematic diagram showing mapping between (i) an antenna port and an antenna panel and (ii) a candidate shift signal sequence according to various examples. FIG. 9 is a flow chart of the method according to various examples. FIG. 10 is a signaling diagram according to various examples. FIG. 11 is a flow chart of a method according to various examples. FIG. 12 is a flow chart of a method according to various examples.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the following description of the embodiments should not be construed in a limited sense. The scope of the invention is not intended to be limited by the embodiments or drawings described below, they are merely exemplary.

The drawings should be considered as schematic representations, and the elements shown in the drawings are not necessarily shown to scale. Rather, the various elements are expressed so that their function and general purpose will be apparent to those skilled in the art. Any connection or connection between functional blocks, devices, components, or other physical or functional units shown in the figure or described herein may be realized by indirect connection or connection. .. The connection between the components may be established via a wireless connection. Functional blocks may be realized by hardware, firmware, software, or a combination thereof.

Some examples of the present disclosure generally present for multiple circuits or other electrical devices. All references to circuits and other electrical devices, as well as the functionality provided by them, are not intended to be limited to those exemplified and described herein. Specific designations may be assigned to the various circuits or other electrical devices disclosed, but such designations are not intended to limit the scope of operation with respect to the circuits and other electrical devices. Such circuits and other electrical devices may be combined with each other and / or separately in any way based on the particular type of desired electrical implementation. Any circuit or other electrical device disclosed herein may be any number of microcontrollers, Graphics Processor Units (GPUs), integrated circuits, memory devices (eg, FLASH®, random). Random Access Memory (RAM), Read Only Memory (ROM), Electrically Programmable Read Only Memory (EPROM), Electrically Erasable Programmable Read Only Memory (Electrically Erasable Programmable Read) Only Memory (EEPROM), or other suitable variants thereof), and it is appreciated that they may be equipped with software that interacts with each other to perform the operations disclosed herein. In addition, any one or more of the electrical devices should execute program code embodied in a non-temporary computer-readable medium programmed to perform any number of functions as disclosed. May be configured.

Hereinafter, techniques for wireless communication using a communication system including two or more nodes will be described. Nodes can implement transmitters and receivers. For example, a communication system may be implemented by a communication network and a UE that is connected to or may be able to connect to the communication network.

The communication network (or simply the network) may be a wireless network. For the sake of brevity, various scenarios are described below based on the implementation form of the communication network by the cellular network. The cellular network contains a plurality of cells. Each cell corresponds to the corresponding sub-area of the total coverage area. Other exemplary implementations include the Institute of Electrical and Electronics Engineers (IEEE) WLAN network, MulteFire, and the like.

Hereinafter, a technique for facilitating signal transmission by a UE including a modem and a wireless interface will be described, wherein the wireless interface includes a modem, a plurality of antenna ports, and a plurality of antenna panels. In general, modems may include a digital front end and an analog front end.

The signal sequence may be output by a modem in the radio frequency (RF) band, for example, in the range of 1 GHz to 40 GHz. In general, a signal sequence may contain multiple time-sequential symbols, each symbol encoding several bits. Specifically, since a modem may include a plurality of antenna ports, the modem can output a plurality of signal sequences via each antenna port. For example, a modem may include multiple amplifiers and phase shifters for each antenna port. Therefore, the antenna port may be a logical entity with an identified reference signal. The antenna port may be a logical entity defined by the modem and mapped to a physical connector. For example, the antenna port may be configured on the physical layer according to the Open System Interface (OSI) model. Symbols and sequences transmitted through the antenna port follow the same propagation conditions on the radio link. Details regarding the antenna port are described, for example, in 3GPP Technical Specification (TS) 36.211 V15.0.0 (2017-12), section 5.2.1. In general, each antenna panel may include one or more antenna arrays. Each antenna array may include multiple antennas in a spatial arrangement that is clearly defined with respect to each other. Phase coherent transmission may be achieved by an antenna array. Here, the phase and amplitude of each RF signal supplied to the separate antennas of the array may be defined relative to each other. This enables beamforming.

In general, beamforming is a technique that adds directivity to the transmission of RF signals, that is, RF energy by using strong and weak interference between RF signals transmitted by different antennas in an antenna array. Means a technique that can determine the preferred direction in which is focused. In that regard, beamforming promotes spatial multiplexing and / or spatial diversity, thereby improving transmission throughput.

The techniques described herein facilitate efficient and accurate beam management. In general, beam management means the logic associated with selecting one or more suitable beams for communication between the UE and the access node of the communication network. For UL communication, the transmission beam may be selected by the UE. Further, in the case of UL communication, it is also possible to select the received beam on the BS. In the case of DL communication, the received beam may be selected by the UE. It is also possible to select a transmission beam on the BS.

For UL communication beam management, the UE may transmit one or more UL reference signal sequences. An exemplary UL reference signal sequence is the UL SRS sequence, which is 3GPP TS 36.211 V15.0.0 (2017-12), section 5.5.3, or 3GPP TS 38.211 V15.3.0, section 6.4.1.3.3. Please refer to. In general, various types and types of UL reference signal sequences may be used, but for the sake of brevity, various examples will be described below in relation to the SRS sequence. In general, there may be a one-to-one mapping between the SRS sequence and the antenna port.

The communication network may measure the reception characteristics of the UL SRS series, such as amplitude, phase, and the like. The network may then determine the quality of the corresponding physical transmission channel from the UE to the access node, where the physical transmission channel is the corresponding transmission beam in the UE and the access node of the communication network from the UE. It is associated with the transmission path to (Access Node: AN) (and generally the receive beam of AN). Such a process is commonly referred to as channel sounding. In addition, beam management is based on channel sounding.

Hereinafter, techniques for promoting reduction of power consumption of the UE will be described. The techniques described herein can facilitate efficient and accurate channel sounding. This technique allows for proper beam selection for reliable and power efficient transmission. Beam management can be adjusted as desired.

According to various examples, this is achieved by providing information about the association between the SRS sequence transmitted by the UE and each antenna port and / or antenna panel used for transmission.

This makes it possible to take into account the activation or deactivation of the antenna panel when performing beam management. For example, it is conceivable that one or more beams formed by the antenna array of the first antenna panel may be selected so that the second antenna panel may be deactivated. In this way, it is possible to reduce the power consumption of the UE.

In general, there are various options useful for providing information regarding the association of the SRS sequence with each antenna port and / or antenna panel.

For example, such information regarding the association between the SRS series and the antenna panel is provided in an older version compatible manner. Therefore, it is possible to reuse existing protocols and standards to reduce complexity.

As a further example, such information regarding the association of the SRS sequence with the antenna panel may be provided in an implicit manner. Therefore, no explicit indicator or separate control signaling is required, which can reduce control signaling overhead. The reduced control signaling overhead increases the power efficiency of the UE. It may also improve overall data throughput due to reduced frequency band access.

For example, it is possible that the UE uses different UL SRS sequences for different antenna ports. Different beams can be selected by outputting the UL SRS series through different antenna ports. In that regard, quality comparisons between physical transmission channels (and transmission beams) associated with different antenna ports may be made by taking into account the reception characteristics of different UL SRS sequences. Therefore, the SRS sequence may indicate the corresponding antenna port used for transmission.

It is also conceivable that the UE will use different SRS sequences for different antenna panels. In that regard, quality comparisons between physical transmission channels associated with different antenna panels may be made by taking into account the reception characteristics of different UL SRS sequences. Therefore, the SRS sequence may indicate the corresponding antenna panel used for transmission. For example, it is conceivable that a UL SRS sequence is selected from a plurality of candidate UL SRS sequences based on a particular antenna panel through which the UL SRS sequence is subsequently transmitted.

In general, there are various options useful for implementing different SRS sequences for different antenna panels and antenna ports. One option is to select different base sequences associated with the SRS sequence for different antenna ports and antenna panels. Alternatively, the UL SRS sequence may be generated based on a base signal sequence and a shift signal sequence, where different shift signal sequences are selected for different antenna ports and antenna panels. To. In other words, the shift signal sequence may be selected from a plurality of candidate shift signal sequences depending on the antenna panel. In other words, according to such an option, the same base signal sequence may be used for different UL SRS sequences transmitted through different antenna panels, but different shift signals for different UL SRS sequences. Series may be used.

In AN, by comparing the received signal sequence (eg, SRS sequence) with various candidate shift signal sequences, it becomes possible to identify the particular shift signal sequence used in the UE, and then AN The antenna panel used to transmit the SRS sequence in the UE can be inferred retroactively. The AN can then use this information as part of beam management. For example, the AN can select the appropriate transmission beam for its UE based on the antenna panel used to transmit the SRS sequence. An exemplary comparison involves checking the correlation between the received signal sequence and the various candidate shift signal sequences.

FIG. 1 schematically shows a wireless communication system 100 that can be effective by the techniques disclosed herein.

The wireless communication system 100 includes AN101 and UE102 of a cellular network (not shown in FIG. 1). Since AN101 is a part of the cellular network, the base station (BS) will be referred to below. In other types of communication systems, other types of AN may be used.

A radio link 111 is established between AN101 and UE102. The radio link 111 includes a downlink (DL) link from AN101 to UE102, and further includes a UL link from UE102 to AN101.

The UE 102 may be one of a smartphone, a cellular phone, a tablet, a notebook, a computer, a smart TV, an MTC device, an eMTC device, an IoT device, an NB-IoT device, a sensor, an actuator and the like.

FIG. 2 shows BS101 and UE102 in more detail.

The BS101 includes a processor 5011, a memory 5015, and a wireless interface 5012 (indicated as Base Band / Front End Module (BB / FEM) in FIG. 2) to form a control circuit. There is. The wireless interface 5012 is connected to an antenna panel 5013 including a plurality of antennas 5019 forming an antenna array via an antenna port (not shown in FIG. 2).

The memory 5015 may be a non-volatile memory. Memory 5015 may store program code that can be executed by processor 5011. By executing the program code, it is related to receiving the signal sequence, comparing the received signal sequence with the reference signal sequence (for example, checking the correlation), and being involved in beam management. The technique may be carried out by processor 5011.

The UE 102 includes a processor 5021, a memory 5025, and a wireless interface 5022 (indicated as baseband / front-end module, BB / FEM in FIG. 2) to form a control circuit. The wireless interface 5022 is connected to an antenna panel 5023 including a plurality of antennas 5029 via an antenna port (not shown in FIG. 2).

The memory 5025 may be a non-volatile memory. Memory 5025 may store program code that can be executed by processor 5021. By executing the program code, controlling the modem of the radio interface 5022 to generate the SRS series 150, controlling the modem to transmit the SRS series 150, and being involved in beam management. The technique related to the above may be performed on the processor 5021.

In the scenario of FIG. 2, the UE 102 is shown to include a single antenna panel 5023, but in general, the UE 102 may include a plurality of antenna panels. Such a scenario is shown in FIG.

FIG. 3 shows an aspect of the wireless interface 5022 of the UE 102. As shown in FIG. 3, the radio interface 5022 includes a modem 5030 that includes three antenna ports 5031-5033. The antenna ports 5031 to 5033 are connected to the two antenna panels 5023 and 5024 via the wiring 5035.

In the example of FIG. 3, the wiring 5035 defines the connection between the antenna port 5031 and the panel 5023, between the antenna port 5032 and the antenna panel 5023, and between the antenna port 5033 and the antenna panels 5023, 5024. .. Generally, a switch 5036 is optionally provided, which allows the RF signal output to be routed from the antenna port 5033 to either the antenna panel 5023 or the antenna panel 5024.

In general, wiring 5035 may be configured differently with different radio interfaces 5022 on different UE 102s. This motivates us to discover that there may be advantages to reporting information on the association of SRS sequences with antenna panels. Further details regarding the transmission of the SRS series will be described with FIG.

FIG. 4 shows an aspect relating to the time-frequency resource element 161 used to transmit the SRS sequence on the radio link 111. As shown in FIG. 4, the time-frequency grid 160 defines a plurality of time-frequency resource elements 161. For example, an Orthogonal Frequency Division Multiplex (OFDM) technique that includes carriers and multiple subcarriers and defines a time slot for a symbol is used to define such a time-frequency grid 160. In some cases.

The time-frequency grid 160 facilitates Time Division Duplexing (TDD) and Frequency Division Duplexing (FDD) so that signals transmitted by different time-frequency resource elements 161 do not interfere. ..

Some of the time-frequency resource elements 161 are used to carry the SRS (in FIG. 4, these time-frequency resource elements 161 are filled in black). For example, the BS 101 and UE 102 may be assigned a specific time-frequency resource element 161 used to transmit the SRS.

In particular, the sequence of time-frequency resource elements 161 is used to carry the SRS sequence. The SRS sequence may occupy a plurality of sequential time-frequency resource elements 161 (eg, M resource elements).

In general, in addition to TDD and FDD, it is also possible to use Code Division Duplexing (CDD). In particular, CDDs may be used to transmit SRS sequences.

By using the CDD, the SRS series originating from the plurality of antenna ports 5031 to 5033 can share the time-frequency resource element 161. This makes it possible to improve the frequency band utilization rate. (FIG. 4 shows a common time-frequency resource grid 160 for brevity, but operational implementations sometimes have a separate time-frequency resource grid prior to the OFDM inverse Fourier transform operation. Note that it may contain definitions). Hereinafter, the details regarding CDD will be described.

The SRS sequence may be implemented by a Zaddoff-Chu sequence of length M = [s ₁ s ₂ ... s _M ]. Here, M is variable from 12 to 1000 or more. Further, since the SRS sequence is associated with a particular antenna port k and a maximum of L antenna ports is allowed, k is in the range from 1 to a maximum of L. The SRS series 150 x _k transmitted from the antenna port k = 1 ... L is formed according to the following equation.

x _k = [x _k1 x _k2 ... x _kM ] (1)

here,
x _km = sm _{f km} (2)
f _km = exp (iφ _k (m-1) / M) and (3)

That is, different SRS sequences transmitted from different antenna ports share the same base sequence s (sometimes also called the root sequence), but they are multiplied by a different number {f _km } for each element (so). Equation (2)) is different. φ _k is sometimes called a cyclic shift.

Vector f _k ,
f _k = [f _k1 f _k2 ... f _kM ] (5)
Corresponds to the so-called shift signal sequence. According to signal theory, the vector f _k defines the discrete Fourier transform of the base series (see equation (3)). Therefore, in the time domain, this corresponds to a shift.

The above facilitates transmission of SRS sequences from different antenna ports that overlap on the time-frequency grid 160 using the CDD. Therefore, in the specific time-frequency resource element 161 the signal indexed by m from {1 ... M} and transmitted is x _1m + x _2m + x _3m + x _4m + ... _XLm . Further, _M is the length of the base series sm (see equation (1)).

The SRS sequences from different antenna ports overlap in the time-frequency grid 160, but they have the multiplicative constants {f _km } of the shift signal sequence forming an orthogonal sequence (ie, f _k f _l ^H = 0, Since k ≠ l), it can be separated by BS101. There are M orthogonal vectors f _k , i.e., M candidate shift signal sequences that will be selected from them.

According to various examples, it is possible to generate an SRS sequence based on a default / fixed base signal sequence and a shift signal sequence selected from candidate shift signal sequences. Specifically, a given SRS sequence shift signal sequence is from a candidate shift signal sequence based on the corresponding antenna port and corresponding antenna panel through which the given SRS sequence will be transmitted. May be selected.

To this end, a new index n is used to represent all candidate shift signal sequences.

f _k → f _n (6)

For example, the total number of possible connections between the antenna port and the antenna panel,

Selection of an appropriate shift signal sequence based on both the antenna port and the antenna panel is also described with FIGS. 5 and 6.

FIG. 5 is a flow chart of a method according to various examples. The method of FIG. 5 may be performed by a UE, eg, UE 102 according to FIGS. 1 and 2. More specifically, FIG. 5 may be performed by modem 5030 on wireless interface 5022 of UE 102.

In block 1001, the SRS sequence is generated based on the base signal sequence and the shift signal sequence, at which time the shift signal sequence is selected from a plurality of candidate shift signal sequences.

At block 1002, the generated SRS sequence is transmitted through the antenna ports of the UE's plurality of antenna ports and through the antenna panels of the UE's plurality of antenna panels.

In block 1001, the shift signal sequence is selected from a plurality of candidate shift signal sequences depending on the particular antenna port and the particular antenna panel through which the SRS sequence is transmitted in block 1002.

This implicitly indicates the antenna port and antenna panel in the SRS series. As a result, the BS on the receiving side can infer the antenna port and the antenna panel retroactively. The receiving BS may use this information to perform beam management. The corresponding technique will be described with FIG.

FIG. 6 is a flow chart of a method according to various examples. The method of FIG. 6 may be performed by BS, eg BS 101 according to FIGS. 1 and 2. More specifically, FIG. 6 may be performed by the BS101 radio interface 5012 and / or processor 5011.

At block 1011 for example, a signal sequence from the UE is received. For example, the signal sequence may be received by one or more resource elements in the time-frequency resource grid allocated for transmission of the SRS sequence (see Figure 4).

Then, in block 1012, the signal sequence received in block 1011 is confirmed to correlate with one or more candidate shift signal sequences. Confirmation of correlation in the time domain is used. Other types of comparisons are also possible.

Then, in block 1013, the antenna panel and the antenna port are determined based on the confirmation of the correlation of block 1012. For example, the maximum correlation value may be identified. Subsequently, the maximum correlation value corresponds to the shift signal sequence used in the UE, and therefore, based on the shift signal sequence, the BS infers retroactively to the particular antenna port and antenna panel used by the UE. be able to.

(I) Antenna ports and antenna panels used by the BS to retroactively infer the specific antenna ports and antenna panels used by the UE to transmit the SRS sequence, and (ii) candidate shift signal sequences. The association may be carried out by the default mapping. The mapping may be synchronized between the UE and the network. The UE may use mapping to select the appropriate shift signal sequence from a plurality of candidate shift signal sequences, depending on the antenna port and antenna panel. Details of such mapping will be described with FIGS. 7 and 8.

FIG. 7 shows an aspect relating to (i) mapping 701 of a plurality of antenna ports in a plurality of antenna panels and (ii) a corresponding shift signal sequence. Different candidate shift sequences are associated with different antenna panels and antenna ports.

As shown in FIG. 7, not all antenna ports may transmit through each antenna panel, for example, the antenna port labeled “X” (corresponding to the antenna port 5031 in FIG. 3). Is transmitted via the antenna panel labeled "A" (corresponding to the antenna panel 5023 in FIG. 3), "B" (corresponding to the antenna panel 5024 in FIG. 3), and "C". , "D" and "E" may not be transmitted via the antenna panel. Such a limitation is imposed by the wiring 5035 between the modem 5030 and the antenna panels 5023, 5024 (see FIG. 3). Therefore, the mapping 701 corresponds to the wiring 5035.

The mapping 701 may be used by the UE 102 when generating an SRS sequence based on the shift signal sequence, and the shift signal sequence is identified by the mapping 701 based on the particular antenna panel and antenna port that will be used. It may be selected from the candidate shift signal sequences to be used (see block 1001 in FIG. 5).

The mapping 701 may also be used by the BS 101 in determining the antenna panel and antenna port, where the BS 101 is for the received signal sequence and at least some of the candidate shift signal sequences indicated by the mapping 701. Correlation checks can be performed (see block 1013 in FIG. 6), and then, based on the mapping, the antenna panel and antenna port associated with the candidate shift signal sequence associated with generating the maximum correlation. to decide.

UE 102 and BS 101 need to use the same mapping 701. As such, it is conceivable that the mapping 701 is, for example, pre-defined for both UE 102 and BS 101 operations according to corresponding standards. Alternatively or additionally, the mapping 701 may be synchronized between the BS 101 and the UE 102, for example using control signaling.

In order to accommodate all antenna port and antenna panel pairs according to the example of FIG. 7, it is necessary to provide seven candidate shift signal sequences. At that time, M> 7, which is feasible (see Equation 9). From time to time, the number M of orthogonal candidate shift signal sequences available is limited (see equation (3)). For example, reducing the length of the base sequence may tend to reduce the number of orthogonal candidate shift signal sequences available, thereby reducing the signaling overhead required for SRS sequence transmission. The shorter base sequence results in a reduction in the time-frequency resource element 161 that would be reserved for SRS sequence transmission. Therefore, there arises a situation where (i) there is a shortage of candidate shift signal sequences available to accommodate all possible pairs of (i) multiple antenna ports and multiple antenna panels and (ii) candidate shift signal sequences. there's a possibility that.

To mitigate such situations, it is possible to determine the mapping taking into account the deactivated antenna panel and the deactivated antenna port. Such a scenario is shown in FIG.

FIG. 8 shows an aspect relating to (i) mapping 702 of a plurality of antenna ports and a plurality of antenna panels and (ii) a corresponding shift signal sequence. The mapping 702 according to the example of FIG. 8 generally corresponds to the mapping 701 according to the example of FIG.

In the example of FIG. 8, the mapping 702 is determined based only on the activated antenna ports "X" and "Z". The antenna port "Y" is deactivated and is therefore removed from the mapping 702. Thereby, the number of candidate shift signal sequences required can be reduced to five. In this way, the magnitude of M is relaxed (see equation (9)). Control signaling overhead can be reduced by allocating a shorter sequence of time-frequency resource elements to the transmission of the SRS sequence.

As an alternative or addition to reducing the number of candidate shift signal sequences required, the length of the base sequence can be increased by alternative means so that a larger number of candidate shift signal sequences are essentially available. .. Therefore, M may be increased. Such techniques will be described with FIG.

FIG. 9 is a flow chart of the method according to various examples. FIG. 9 illustrates aspects relating to (i) determination of mappings 701 and 702 between a plurality of antenna ports on a plurality of antenna panels and (ii) corresponding candidate shift signal sequences. For example, the method of FIG. 9 may be performed completely or partially on the UE. The method of FIG. 9 may be fully or partially performed on the BS.

At block 1021, the active antenna port is determined. In other words, the antenna port to be deactivated is determined. For example, the deactivated port may be in a stopped state or a sleep state, at which time no RF signal can be output via the deactivated antenna port.

At block 1022, the active antenna panel is determined. In other words, the antenna panel to be deactivated is determined. For example, the deactivated antenna panel may be in a stopped state or a sleep state, in which the transmission of RF signals cannot occur.

At block 1023, the connection of the wiring between the antenna panel and the antenna port is determined (see FIG. 3). Specifically, the wiring connection between the active antenna panel and the active antenna port is determined based on the results of blocks 1021 and 1022.

Next, at block 1024, the mapping is determined. This may be based on the wiring connection between the active antenna port and the active antenna panel. Specifically, it is conceivable to assign a corresponding candidate shift signal sequence to each of the active antenna panel and active antenna port pairs made possible by the coupling by block 1023.

It is then possible in block 1025 to determine the length of the base signal sequence based on the number of candidate shift signal sequences required. The length of the base signal sequence is sufficient to accommodate all required candidate shift signal sequences, but can be chosen to be as short as possible to reduce signaling overhead.

Therefore, in general, it is possible to select the length of the base signal sequence depending on the number of antenna ports and / or the number of antenna panels and / or the connection between the antenna ports and the antenna panel. For example, the length of the base series may be chosen such that M> T (see equation (8A)). That is, the length of the base sequence is such that for every possible connection between the antenna port and the antenna panel, a shift signal sequence for a particular purpose is available, and for each pair of shift signal sequences. Orthogonality can be chosen to be maintained.

Optionally, the activation state of the antenna panel and / or the activation state of the antenna port can be taken into account. For example, in equation (8A), summing may only be done on all activated antenna ports.

FIG. 10 is a signaling diagram of communication between BS 101 and UE 102.

At 4500, the DL control signal 152 is transmitted by the BS 101 and received by the UE 102. For example, a Radio Resource Control (RRC) DL control information message containing a corresponding indicator or information field may be communicated at 4500. The DL control signal indicates whether selection of the shift signal sequence is performed depending on both the antenna ports 5031 to 5033 and the antenna panels 5023 and 5024. As an example, the DL control signal takes two or more values. The first value may indicate that a shift signal sequence is selected from a plurality of candidate shift signal sequences, depending only on the antenna port (but not on the antenna panel), and the second value may indicate that the shift signal sequence is selected. It may indicate that a shift signal sequence is selected from a plurality of candidate shift signal sequences, depending on both the antenna port and the antenna panel. A third value (optionally) may indicate that a shift signal sequence is selected from a plurality of candidate shift signal sequences, depending only on the antenna panel (but not on the antenna port).

In the example of FIG. 10, the DL control signal 152 shows that the selection of the shift signal sequence from the plurality of candidate shift signal sequences is determined by both the antenna port and the antenna panel.

In the example of FIG. 10, the DL control signal 152 is transmitted (thus, the decision logic for the configuration of the SRS sequence is located at BS101), but in another example, the corresponding decision logic resides in the UE 102. The UL control signal may be transmitted by the UE 102 and received by the BS 101.

Further, in the scenario of FIG. 10, a clear indicator is used to indicate whether shift signal sequence selection is made for both antenna ports 5031-5033 and antenna panels 5023, 5024. In another example, a more implicit indication may be implemented. For example, define how the SRS sequence is used (for example, for beam management, UL channel sounding information acquisition for codebooks, UL channel sounding information acquisition for non-codebooks, DL channel sounding information acquisition, etc.). The parameter may be reused, in which case the parameter defines beam management and can select a shift signal sequence from multiple candidate shift signal sequences depending on both the antenna port and the antenna panel. ..

At 4501, the UE 102 transmits the configuration control message 151 to the BS 101. For example, the configuration control message 151 is the number of antenna ports, the number of antenna panels, the number of antenna ports activated, the number of antenna panels activated, the number of antenna ports deactivated, the number of deactivated antenna ports. The minimum number of antenna panels, the wiring between the antenna port and the antenna panel, and the like may be shown.

Based on the information contained in the configuration control message 151, both the BS 101 and the UE 102 can determine the appropriate mappings 701 and 702. In that regard, the mappings 701 and 702 may be synchronized between the UE 102 and the BS 101.

In the example of FIG. 10, implicit information that allows the mapping to be determined on both the BS 101 and the UE 102 is transmitted as part of the configuration control message 151, whereas in other examples the applicable mapping 701 , 702 may be communicated between the UE 102 and the BS 101 with clearer information. For example, a particular mapping may be selected from the codebook.

Subsequently, from 4502 to 4504, a plurality of SRS series 150 are transmitted by the UE 102 and received by the BS 101. The SRS sequence 150 is transmitted on a shared time-frequency resource element 161 using a CDD (not shown in FIG. 10), which is achieved by using different shift signal sequences. The shift signal sequence difference is selected from a plurality of candidate shift signal sequences depending on the particular antenna port and antenna panel of the SRS sequence. For this purpose, the mappings 701 and 702 determined based on the information content of the configuration control message 151 are used. The BS 101 also uses the mappings 701 and 702 to determine the pair of specific antenna ports and antenna panels used to transmit the respective SRS sequences.

Details on how to use the mappings 701 and 702 will be described below together with FIGS. 11 and 12.

FIG. 11 is a flow chart of a method according to various examples. The method of FIG. 11 may be performed by a UE, eg, UE 102 according to FIG. 1 or FIG. The method of FIG. 11 illustrates aspects relating to the generation of a plurality of SRS sequences 150. For example, the method of FIG. 11 may be performed as part of block 1001 of the method according to FIG.

First, block 1031 is checked to see if there are any remaining activated antenna ports for which the corresponding SRS sequence 150 needs to be generated. In the case of yes, block 1032 selects the current antenna port among the remaining active antenna ports.

Next, in block 1033, a subset of candidate shift signal sequences is determined from all available candidate shift signal sequences, the available candidate shift signal sequences being defined by the corresponding mappings 701, 702 ( The mappings 701 and 702 are optionally determined in sequence by the length of the base signal sequence and / or may be synchronized with BS101).

The subset is associated with the corresponding antenna port. The subset has a size corresponding to the number of antenna panels available for a particular antenna port (see, eg, FIGS. 7 and 8), the subset of candidate shift sequences associated with port "X" is n. = {1, 2, 3}). This may take into account wiring 5035 (see Figure 3), but in a simple scenario it is assumed that all antenna panels are available for transmission over the corresponding antenna port. There is.

Next, in 1034, the particular shift signal sequence that will be used to generate the SRS sequence 150 is selected from a subset based on the corresponding antenna panel (see, eg, FIGS. 7 and 8). When "B" is used, n = 2 is selected from the subset n = {1,2,3}).

Then, in block 1035, the SRS sequence is generated by element-by-element multiplication of the selected shift signal sequence and the base signal sequence (see equation (2)).

Next, block 1031 is re-executed at the next iteration. If there are no active ports left for which the corresponding SRS series 150 needs to be generated, the method ends at block 1036.

The operation of the method of FIG. 11 may be further illustrated with respect to a scenario in which all P antenna panels are connected to all L antenna ports, i.e. there is wiring between L and P. .. Here, the L * P shift signal sequence is required to correspond to all possible antenna port and antenna panel pairs (see equation (8)). Therefore, the number of L * P candidate shift signal sequences represented by the vector f _n (see equations (3) and (6)) is required. That is, φ _n = (n-1) π / (L * P). Again, the index n corresponds to a particular pair of antenna port k and antenna panel p. For example, n may be derived by n = L * (p-1) + k-1. In this scenario, L * P candidate shift signal sequences may be assigned to L subsets, each subset containing P vectors. Next, the p-th vector from the k-th subset is selected for the SRS sequence transmitted via the antenna port k and the panel p.

FIG. 12 is a flow chart of a method according to various examples. The method of FIG. 12 may be performed by BS, eg, BS 101 according to FIG. 1 or FIG. The method of FIG. 12 and the method of FIG. 11 are related to each other. The method of FIG. 12 describes an aspect relating to the determination of the antenna port and the antenna panel transmitting the SRS series 150 received by the BS. For example, the method of FIG. 12 may be performed as part of blocks 1012 and 1013 of the method according to FIG.

In FIG. 12, the BS 101 receives a signal sequence including a plurality of code-multiplexed SRS sequences in a series of time-frequency resources. Each of the SRS sequences corresponds to a particular antenna port of multiple antenna ports.

First, block 1041 is checked to see if there are any remaining active antenna ports on the UE to be checked. Block 1041 is associated with a plurality of iterations of the outer loop 1099, where each iteration of the outer loop 1099 corresponds to a particular one of the code-multiplexed SRS sequences.

If the check in block 1041 is yes, block 1042 selects the current antenna port.

At block 1043, a subset of all candidate shift signal sequences is determined based on the current antenna port selected at block 1042. Here, predetermined mappings 701 and 702 may be taken into account. All candidate shift signal sequences associated with the current antenna port may be included in the subset.

Then, in block 1044, it is checked whether another candidate shift signal sequence to be checked remains for the subset of candidate shift signal sequences determined in block 1043. Block 1044 is associated with an inner loop 1098 that repeats multiple times.

In the case of yes, block 1045 selects the current candidate shift signal sequence from the subset, and block 1046 checks the correlation between the current candidate shift signal sequence and the received signal sequence. The magnitude of the correlation may be remembered. Block 1044 is then re-executed on the next iteration of inner loop 1098.

If at block 1044 it is determined that there is no other candidate shift signal sequence to check for the current port, the method begins at block 1047. Here, the shift signal sequence used in the UE to generate the SRS sequence associated with the current iteration of outer loop 1099 is determined based on the maximum value of all correlation checks repeated in inner loop 1098. Will be done.

The antenna panels and antenna ports used by the UE to transmit the current SRS sequence can then be retroactively inferred based on the mappings 701 and 702.

Block 1041 is then re-executed. That is, it is checked whether additional antenna ports need to be considered, i.e., whether additional SRS sequences need to be identified. In the case of yes, at block 1042, the next antenna port is selected and the next iteration of outer loop 1099 begins. If not, the method ends at block 1049.

The operation of the method of FIG. 12 may be further described for a scenario in which all P antenna panels are connected to all L antenna ports. Antenna port k = 1. .. For each L, (i) confirmation of the correlation between the received signal sequence and P candidate shift signal sequences in the subset k (see blocks 1045 and 1046), (ii) determination of the maximum value of the above correlation value (block). 1047), and (iii) if the maximum value corresponds to the p-th candidate shift signal sequence in the above subset, it is determined whether the antenna port k transmits the SRS sequence on the antenna panel p. ..

In summary, we have described techniques that make it easy to indicate from which antenna panel and antenna port the SRS sequence was transmitted. In the reference implementation, the received signal sequence is confirmed to correlate with the L candidate shift signal sequences, but each of the candidate shift signal sequences corresponds to one antenna port. According to the examples described herein, the received signal sequence correlates with up to L * P candidate shift signal sequences to accommodate information about the antenna ports used for transmission. It is possible to accommodate additional information about the antenna panel.

Simple example: A 3-bit word carries eight different states. In the reference implementation, only the first 2 bits (4 states) indicate the antenna port used, and according to each example, the third bit is used to indicate the antenna panel used.

Various techniques vary as long as the shift signal sequences used are orthogonal to each other for flat channel fading, i.e. for channels where all M symbols of the SRS sequence experience the exact same channel. It is based on finding that the error performance in the discrimination between the code-multiplexed SRS series on the receiving side is good. However, in the case of a selective channel, the error performance may be deteriorated because the assumption of the orthogonality of each pair of the shift signal series by the DFT vector f _n is not valid. By using more candidate shift signal sequences to accommodate information about the antenna panel, it is more likely to result in pairs of shift signal sequences that are not orthogonal to each other.

Various techniques are further based on finding that in practical communication systems, such non-orthogonal shift signal sequences do not impose significant restrictions. First, millimeter-wave channels have been found to be directional, and therefore are not as strict in frequency selectivity as sub-6 GHz channels. Second, typically, the number of panels is generally two or three, which is not very large. Therefore, L * P remains small (see equation (8)). Third, the SRS sequence is partially transmitted in the frequency domain and partially in the time domain. In the time domain, there is little channel selectivity.

Moreover, in many cases, not all L antenna ports available in hardware can be used for the channel. If few ports are activated (and some antenna ports are deactivated), the candidate shift signal sequence may not be supplied to the deactivated antenna ports. Instead, the available candidate shift signal sequences may be mapped only to the activated antenna port and the activated antenna panel (see Figure 8).

The examples described are summarized below.
Example 1
A method of operating a wireless communication device (102).
-Generating a reference signal sequence (150) based on a base signal sequence and a shift signal sequence selected from a plurality of candidate shift signal sequences (1001),
-Antenna panels (5023, 5024) of the plurality of antenna panels (5023, 5024) of the wireless communication device (102) through the antenna ports (5031-5033) of the plurality of antenna ports (5031-5033) of the wireless communication device (102). 5023, 5024), including transmitting the reference signal sequence (150) and (1002).
The shift signal sequence is selected from a plurality of candidate shift signal sequences depending on the antenna port (5031-5033) and antenna panel (5023, 5024) used to transmit the reference signal sequence (150). ..
Example 2
-Selecting a subset of candidate shift signal sequences from multiple candidate shift signal sequences based on the antenna port (5031-5033).
The method of Example 1, further comprising selecting a shift signal sequence from a subset of candidate shift signal sequences based on an antenna panel (5023, 5024).
Example 3
-A number of multiple antenna ports (5031-5033), or at least one of a number of antenna panels (5023, 5024), or a plurality of antenna ports (5031 to 5033) and a plurality of antenna panels (5023). , 5024), the method of Example 1 or Example 2, further comprising selecting the length of the base signal sequence.
Example 4
The shift signal sequence is based on (i) mapping between multiple antenna ports (5031-5033) and multiple antenna panels (5023, 5024) and (ii) multiple candidate shift signal sequences (701, 702). Any one of Examples 1 to 3 selected from a plurality of candidate shift signal sequences.
Example 5
The method of Example 4, wherein the mapping (701, 702) is predetermined or synchronized between the access node (101) and the wireless communication device (102).
Example 6
-Determining the mapping (701, 702) based on one or more active antenna panels (5023, 5024) of multiple antenna panels (5023, 5024), or active antenna ports (5031 to 5033). The method of Example 4 or Example 5, further comprising.
Example 7
-Communicating a control signal (152) indicating whether a shift signal sequence is selected from a plurality of candidate shift signal sequences according to the antenna port (5031) and the antenna panel (5023, 5024). Any one of Examples 1 to 6.
Example 8
It is a method of operating the access node (101) of the communication network.
-Receiving a signal sequence from the wireless communication device (102) (1011),
-Comparing the signal sequence with the candidate shift signal sequence of the plurality of candidate shift signal sequences (1012), each of which is a plurality of antenna panels (5023, 5024) of the wireless communication device (102). ), And the antenna ports (5031-5033) of the plurality of antenna ports (5031-5033) of the wireless communication device (102).
-A method comprising determining (1013) an antenna panel (5023, 5024) and an antenna port (5031-5033) based on the above comparison.
Example 9
The above comparison is for each antenna port (5031 to 5033) of the plurality of antenna ports (5031-5033).
-Selecting a subset of candidate shift signal sequences from multiple candidate shift signal sequences based on the corresponding antenna port (5031-5033).
-The method of Example 8, comprising comparing a signal sequence with a corresponding subset of candidate shift signal sequences.
Example 10
The antenna panels (5023, 5024) and antenna ports (5031-5033) are (i) a plurality of antenna ports (5031-5033) and a plurality of antenna panels (5023, 5024), and (ii) a plurality of candidate shift signal sequences. The method of Example 8 or Example 9, further determined based on the mapping with (701, 702).
Example 11
The method of Example 10, wherein the mapping (701, 702) is predetermined or synchronized between the access node (101) and the wireless communication device (102).
Example 12
-Determining the mapping (701, 702) based on one or more active antenna panels (5023, 5024) of multiple antenna panels (5023, 5024), or active antenna ports (5031-5033). The method of Example 10 or Example 11 further comprising.
Example 13
A wireless communication device (102) including a control circuit (5021, 5022, 5025), wherein the control circuit is.
-Generate a reference signal sequence (150) based on the base signal sequence and the shift signal sequence selected from multiple candidate shift signal sequences.
-Antenna panels (5023, 5024) of the plurality of antenna panels (5023, 5024) of the wireless communication device (102) through the antenna ports (5031-5033) of the plurality of antenna ports (5031 to 5033) of the wireless communication device (102). It is configured to transmit the reference signal sequence (150) via 5023, 5024).
The shift signal sequence is selected from a plurality of candidate shift signal sequences depending on the antenna ports (5031 to 5033) and antenna panels (5023, 5024) used to transmit the reference signal sequence (150). Communication device.
Example 14
The wireless communication device (102) of Example 12, wherein the control circuit (5021, 5022, 5025) is configured to perform any one of the methods of Examples 1-7.
Example 15
An access node (101) of a communication network, wherein the access node (101) includes a control circuit (5011, 5012, 5015), and the control circuit is a control circuit.
-Receive a signal sequence from the wireless communication device (102) and
-Compare the signal sequence with the candidate shift signal sequence of the plurality of candidate shift signal sequences, and each of the candidate shift signal sequences is the antenna panel (5023, 5023) of the plurality of antenna panels (5023, 5024) of the wireless communication device (102). 5024), and the antenna ports (5031-5033) of the plurality of antenna ports (5031-5033) of the wireless communication device (102).
-An access node configured to determine the antenna panel (5023, 5024) and antenna port (5031-5033) based on the above comparison.
Example 16
The control circuit (5011, 5012, 5015) is an access node (101) of Example 14 configured to perform any one of Examples 8-12.

Although the present invention has been shown and described with respect to certain preferred embodiments, equivalents and modifications will be made by those skilled in the art upon reading and understanding the present specification. The present invention includes all such equivalents and modifications and is limited only by the appended claims.

For example, various examples have been described for SRS sequences, but similar techniques may also be used for other types and types of reference signals, such as DL reference signals or sidelink reference signals.

Claims (10)

A method of operating a wireless communication device (102).
-Generating a reference signal sequence (150) based on a base signal sequence and a shift signal sequence selected from a plurality of candidate shift signal sequences (1001),
-Antennas through the antenna ports (5031-5033) of the plurality of antenna ports (5031-5033) of the wireless communication device (102) and of the plurality of antenna panels (5023, 5024) of the wireless communication device (102). The reference signal sequence (150) is transmitted via the panel (5023, 5024) and includes (1002).
The shift signal sequence is selected from the plurality of candidate shift signal sequences depending on the antenna port (5031-5033) and the antenna panel (5023, 5024) used to transmit the reference signal sequence (150). How to be done. -Selecting a subset of the candidate shift signal sequences from the plurality of candidate shift signal sequences based on the antenna port (5031-5033).
-The method of claim 1, further comprising selecting the shift signal sequence from a subset of the candidate shift signal sequence based on the antenna panel (5023, 5024). -At least one of the number of the plurality of antenna ports (5031-5033), or the number of the plurality of antenna panels (5023, 5024), or the plurality of antenna ports (5031-5033) and the plurality of antennas. The method of claim 1 or 2, further comprising selecting the length of the base signal sequence depending on the connection with the panel (5023, 5024). The shift signal sequence is (i) a mapping between the plurality of antenna ports (5031-5033) and the plurality of antenna panels (5023, 5024) and (ii) the plurality of candidate shift signal sequences (701, 702). The method according to any one of claims 1 to 3, which is selected from the plurality of candidate shift signal sequences based on the above. The method of claim 4, wherein the mappings (701, 702) are predetermined or synchronized between the access node (101) and the wireless communication device (102). -Determining the mapping (701, 702) based on one or more active antenna panels (5023, 5024) of the plurality of antenna panels (5023, 5024), or active antenna ports (5031-5033). The method of claim 4 or 5, further comprising: -Communicating a control signal (152) indicating whether the shift signal sequence is selected from the plurality of candidate shift signal sequences according to the antenna port (5031) and the antenna panel (5023, 5024). The method according to any one of claims 1 to 6, further comprising. It is a method of operating the access node (101) of the communication network.
-Receiving a signal sequence from the wireless communication device (102) (1011),
-By comparing the signal sequence with a candidate shift signal sequence of a plurality of candidate shift signal sequences (1012), each of the candidate shift signal sequences is a plurality of antenna panels of the wireless communication device (102) (1012). 5023, 5024) antenna panel (5023, 5024), and the antenna port (5031-5033) of the plurality of antenna ports (5031-5033) of the wireless communication device (102) to be compared.
-A method comprising determining (1013) the antenna panels (5023, 5024) and the antenna ports (5031 to 5033) based on the comparison. -The comparison is for each antenna port (5031 to 5033) of the plurality of antenna ports (5031 to 5033).
-Selecting a subset of the candidate shift signal sequences from the plurality of candidate shift signal sequences based on the corresponding antenna port (5031-5033).
-The method of claim 8, comprising comparing the signal sequence with the candidate shift signal sequence of the corresponding subset. The antenna panels (5023, 5024) and the antenna ports (5031 to 5033) are (i) the plurality of antenna ports (5031 to 5033) and the plurality of antenna panels (5023, 5024), and (ii) the plurality. The method according to claim 8 or 9, further determined based on the mapping (701, 702) with the candidate shift signal sequence of.

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